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Plant a Guerrilla Garden
Spring has sprung over many parts of the US, and now that the earth is beginning to wake back up from a hard winter, it's time to decorate.
Gardeners across the nation are pulling off their gloves and giving their green thumbs some much needed sunshine and dirt. But there is a new form of gardener who is helping to spruce up sad, drab, public spaces. Meet the Guerrilla Gardener.
Based on the idea that even ugly spaces like abandoned construction sites, medians, vacant lots, etc. should not be deprived of beautiful flowers, Guerrilla Gardeners set out (usually under the cloak of darkness) and bring life to these otherwise neglected spaces.
Some Guerrilla Gardeners really perk up a dead space with potted plants, bushes and other garden art, but my favorite type of Guerrilla Gardener is much more sneaky. They unleash their beautification with more covert seedpods.
Seedpods are super easy to make, and really fun to deploy. All you need is a few flower seed packets (try to find flowers that thrive on neglect) and some clay-type dirt. With materials in hand, it's time to assemble your seedpods. Just mix the seeds with the clay, let them harden, and -BAM- you've got a seedpod.
Now comes the fun part. Gather all your seedpods and do a Guerrilla Gardener drive-by (or walk-by if you prefer). Like I said, it's more fun to do under the cloak of darkness. Just drive by the area you want to beautify and then chuck a few seedpods out the window making sure they land in dirt covered areas. Then let Mother Nature do the rest.
As it rains, the clay will release the seeds and they will start to grow. TADAH, instant flower beautification!
It's important to pick places that are truly abandoned or not kept up. You don't want someone coming by and mowing down, or pulling up your beautiful creation.
Make sure you pick flowers with lots of visual impact (sunflowers are great), and if they are perennials (or even annuals that easily reseed) that's even better because they will come back year after year.
So what are you waiting for? Get some seeds and some dirt, and start planting your Guerrilla Garden!

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Comments
Or as @Elvenspider on Twitter says "Better yet, make them with indigenous plant seeds for healthier effect on local area! :)" That's a great idea Elvenspider. Thanks!
Thank you for the mention, Brian!
Seed-bombing with indigenous plants from your area gives them a better chance of surviving because they've evolved to grow there. Not only that, they'll benefit native butterflies and other beneficial bugs as well.
Here are some links (with images!) that can help get a savvy Guerrilla Gardener get started. Good luck!
USA: http://plants.usda.gov/java/
CAN: http://nativeplants.evergreen.ca/